"This is the problem: You want to open a file using something other than the default application. You right-click its icon in the Finder, choose Open With, and a submenu pops up with an absurd number of duplicate entries." This is so annoying. Dr. Dang made a little addition to .bashrc so you can fix it with a single command. Now it's up to Apple to actually fix the problem (via Daring Fireball).

Tcsh hasn't been the default shell for OS X since at least 10.2, if I remember correctly. It is my preferred shell though, and fortunately it's still there without having to install any additional packages.